| 1. | It is colorless in plane polarized light, and it is weakly pleochroic.
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| 2. | Kamiokite is strongly pleochroic and is also birefringent.
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| 3. | It is pleochroic and has a higher refractive indices and surface relief than actinolite.
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| 4. | The pleochroic colours are at their maximum when light is polarized parallel with a crystallographic axis.
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| 5. | Its color in plane polarized light is green-brown, and it is weakly pleochroic.
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| 6. | Elbaite is allochromatic, meaning trace amounts of impurities can tint crystals, and it can be strongly pleochroic.
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| 7. | A related phenomenon is the formation of pleochroic halos surrounding minute zircon inclusions within a crystal of biotite or other mineral.
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| 8. | The 3T polytype, however, is not commonly pleochroic but can show green pleochroism if it is high in iron.
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| 9. | It is mildly pleochroic, with X colorless, Y colorless to pale brown or green and Z generally reddish brown.
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| 10. | When the mineral is rotated on the microscope stage its color does not change, indicating that it is non-pleochroic.
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